Unexpected token ” + token + ” in ” + reducerName + “. – Elasticsearch Error How To Solve Related Issues



Unexpected token ” + token + ” in ” + reducerName + “. – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 

 

This guide will help you check for common problems that cause the log “Unexpected token ” + token + ” in ” + reducerName + “.” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: search, aggregations.


Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”Unexpected token ” + token + ” in [” + reducerName + “].”classname  is BucketSelectorPipelineAggregationBuilder.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

} else {
  throw new ParsingException(parser.getTokenLocation();
  "Unknown key for a " + token + " in [" + reducerName + "]: [" + currentFieldName + "].");
  }
  } else {
  throw new ParsingException(parser.getTokenLocation(); "Unexpected token " + token + " in [" + reducerName + "].");
  }
  }
 
  if (bucketsPathsMap == null) {
  throw new ParsingException(parser.getTokenLocation(); "Missing required field [" + BUCKETS_PATH.getPreferredName()

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 ElasticSearch/npm: elasticdump: Unexpected token error during dumping of response data -views 679 

elasticsearch kibana update document which has space using update by query -views   543



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